Castle of Atienza dominates the skyline of Atienza, Spain, standing on a rocky prominence visible for miles across the landscape. This fortress originated during the 11th and 12th centuries under Muslim rule on sites previously occupied by Roman and Visigothic fortifications, reflecting centuries of strategic importance. After Alfonso VI captured the castle in 1085, Christian rulers enlarged and reinforced it multiple times, maintaining its status as an nearly impregnable frontier defense along the Duero River during the 10th and 11th centuries. Though now in ruins, its tall tower remains a distinctive landmark recognized across the region. The site was officially designated a Cultural Interest Property in 1931.
